Syntheses,Structures,and Properties Of Coordination Polymers Constructed By An Azamacrocycle-Based Tetracarboxylate

Four two dimensional coordination polymers,{[Zn₂?L??biim-4?]·2H₂O}n ?1?, {[Zn₂?L??biim-4?]·2H₂O}n ?2?, [Cd2?L??biim-4??DMF?2]n ?3? and{[CO₂?L??biim-4?]·3H₂O}n ?4?, where H4L= 1,4,8,11-tetrazacyclotetradecane-N,N',N",N'"-tetra-methylene-benzoic acid and biim-4=1,1'-?1,4-butanediyl?bis?imidazole?, have been synthesized under solvothermal conditions. In the structures, L anions and biim-4 ligands unite their respective metal ions to furnish layer with binuclear units. The layers are further connected by C-H…? interactions into three dimensional supramolecular architectures, respectively. The compounds were characterized by Infrared spectrum and powder x-ray diffraction patterns. The luminescent recognition properties of polymers 1-3 to metal cations, anions and small organic molecules have also been explored systematically. The results demonstrate that 1-3 display high sensitive and selective luminescent sensing towards Fe3+ ion, Cr2O72- anion and nitrobenzene. The variable-temperature magnetic susceptibility of polymer 4 was also investigated.